How do I install mods?

Uh dude, not to be mean but in almost every single mod there is, the instructions on how to install whatever mod you wanted are literally in the original post of the mod in question. As a general rule you simply drop them into the game's root folder.


Nitpicking Bastard
Hey man.. turn off your caps-lock; there's no need to shout.

Start here:

Now to get mods, find the Mod Releases sub-forum for the game you want to mod. In this case, Saints Row: The Third.
In that forum you'll find several posts that describe the mod they represent.
Open those posts and read the thread.
You'll see the file for the mod attached. Follow the directions in the guides section or in the readme file attached to the mod.